缓蚀剂类型和含水率对碳钢在H2S/CO2环境中腐蚀行为的影响
2017-10-14,,,,,
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(1. 中国石油集团工程技术研究院,天津 300451;2. CNPC石油管工程重点实验室 涂层材料与保温结构研究室,天津 300451)
缓蚀剂类型和含水率对碳钢在H2S/CO2环境中腐蚀行为的影响
李玲杰1,2,杨耀辉1,2,张彦军1,2,林竹1,2,童辉1,2,王志涛1,2
(1.中国石油集团工程技术研究院,天津300451;2. CNPC石油管工程重点实验室涂层材料与保温结构研究室,天津300451)
在不同含水率条件下,研究了水溶型、油溶型、油溶水分散三种类型缓蚀剂对A106钢在模拟油田产出水中的缓蚀作用。结果表明:水溶型缓蚀剂的缓蚀效果优于油溶型和油溶水分散型缓蚀剂的;当缓蚀剂添加量为50mg/L时,随着含水率升高,水溶型缓蚀剂的缓蚀效果变好,油溶型缓蚀剂的缓蚀效果变差,油溶水分散型缓蚀剂的缓蚀效果变化没有规律;缓蚀剂的油水分配比对缓蚀效果有明显影响, 分配比越小缓蚀效果越好。
缓蚀效果;分配比;含水率;缓蚀剂类型
Abstract: The corrosion inhibition of water soluble, oil soluble and oil soluble water dispersed corrosion inhibitors in simulated produced water in oil-field with different water content was studied. The experimental results show that the inhibition effect of water soluble corrosion inhibitor was the best. When the inhibitor concentration was 50 mg/L, with the increase of water content, the inhibition effect of water soluble corrosion inhibitor got better, but the inhibition effect of oil soluble corrosion inhibitor got worse, and the inhibition effect of oil soluble water dispersed corrosion inhibitor did not show regulation. The distribution ratio of inhibitor in oil and water phases had obvious influence on the inhibition effect of corrosion inhibitor. The smaller the distribution ratio, the greater the inhibition effect.
Keywords: inhibition effect; distribution ratio; moisture content; corrosion inhibitor type
油气开采过程中常含有H2S和CO2等腐蚀性气体,且油田产出水含盐量高,管道服役条件苛刻[1]。添加缓蚀剂是防止管道内部严重腐蚀的最有效方法[2]。该技术成本低,初期投资少,技术灵活,能够适应各种工艺条件,而且可根据实际生产情况进行方案调整,是抑制腐蚀行之有效的方法。
目前,对于缓蚀剂的研究主要集中在缓蚀剂合成工艺优化[3-4]、缓蚀剂性能评价[5]、缓蚀机理研究[6-7]、缓蚀剂复配物选择和确定最佳配比[8]等方面,但这些研究并不能很好地用于指导实际工作。在高矿化度且含H2S和CO2腐蚀气体的环境中,不同类型缓蚀剂在同一腐蚀环境中的缓蚀效果有何差别,含水率等工艺参数调整对缓蚀效果有何影响,尚缺乏研究,这给油田防腐工艺设计和操作运行带来了很大的不确定性,无法有效地控制腐蚀风险。……
